We report on the electrocatalytic properties of sputtered iridium oxide films (SIROF's) in acidic electrolytes. Long term stability (240 hr) is demonstrated. Typical steady‐state currents are 75 mA/cm2 at 1.85V (vs. RHE), which is 50% higher than previously reported. In addition, we introduce a new method of determining Tafel slopes based on the short‐time decay of the oxygen evolution reaction (OER) current, corrected for the capacitative component. Tafel plots are presented for samples of different thickness and degree of hydration. The high current density and absence of corrosion demonstrate the superior catalytic properties of SIROF's vs. iridium over the entire voltage range investigated.